Plasma Display

A display in which sets of parallel conductors at right angles to each other are deposited on glass plates, with the very small space between the plates filled with a gas; each intersection of two conductors defines a single cell that can be energized to produce a gas discharge forming one element of a dot – matrix display.

Also called “Gas discharge display”, a flat – screen technology that uses tiny cells lined with phosphor that are full of inert ionized gas (typically a mix of xenon and neon). Three cells make up one pixel (one cell has red phosphor, one green, one blue). The cells are sandwiched between x and y axis panels, and a cell is selected by charging the appropriate x and y electrodes. The charge causes the gas in the cell to emit ultraviolet light, which causes the phosphor to emit color. The amount of charge determines the intensity, and the combination of the different intensities of red, green and blue produce all the colors required.

 Liquid Crystal Display

Liquid Crystal Display technology is based on the properties of polarized light. Two thin, polarized panels sandwich a thin liquid – crystal gel that is divided into individual pixels. An x/ygrid of wires allows each pixel in the array to be activated individually. When an LCD pixel darkens, it polarizes at 90 degree to the polarizing screens. This pixel has darkened. The pixel darkens in proportion to the voltage applied to it; for a bright detail, a low voltage is applied to the pixel; for a dark shadow area, a higher voltage is applied.

 Technology Comparision